Why does \filter sometime return an array of arrays?

[gabrielflorit]

Say we have a $towns array:

[
  {
    town: "Easton",
    customers: 5
  }, {
    town: "Andover",
    customers: 9
  }
]

The following

$result = F\filter($towns, function($town) {
  return $town->customers > 5;
});

returns an array of items keyed by the original position:

{
  1: {
    town: "Andover",
    customers: 9
  }
}

but comparing greater than -1

$result = F\filter($towns, function($town) {
  return $town->customers > -1;
});

returns the expected structure

[
  {
    town: "Easton",
    customers: 5
  }, {
    town: "Andover",
    customers: 9
  }
]

Any thoughts?

[lstrojny]

filter() and Functional PHP in general tries to preserve keys whereever possible. As I am guessing you are doing json_encode() on the data, do array_values(json_encode()) if you want to force a list as a result. json_encode() encodes an array as an object if there is no index 0, array_values() can fix that for you.